http://www.speech.cs.cmu.edu/flite/

AHI is supported in Flite through a specific backend that uses AHI's AUDIO:
device handler. An OS4 native AHI-Handler exists and can be downloaded from
either OS4Depot or Aminet.

AHI audio backend source code is available here:
http://www.a500.org/downloads/development/flite-ahidriver_7z.readme

Installation:

Copy bin/#? C:

Usage:

flite -t "Hello Amigaworld"

drwxrwxrwx 0/0               0 2011-12-02 03:32 flite.i386-aros/
-rwxrwxrwx 0/0            1962 2002-12-30 07:19 flite.i386-aros/ACKNOWLEDGEMENTS
drwxrwxrwx 0/0               0 2011-12-02 03:22 flite.i386-aros/bin/
-rwxrwxrwx 0/0         9121477 2011-12-02 03:15 flite.i386-aros/bin/flite
-rwxrwxrwx 0/0         9670639 2011-12-02 03:15 flite.i386-aros/bin/flite_time
-rwxrwxrwx 0/0         9121429 2011-12-02 03:15 flite.i386-aros/bin/t2p
-rwxrwxrwx 0/0            5166 2002-12-30 05:49 flite.i386-aros/COPYING
drwxrwxrwx 0/0               0 2011-12-02 03:21 flite.i386-aros/doc/
-rwxrwxrwx 0/0           23027 2001-06-17 04:32 flite.i386-aros/doc/alice
-rwxrwxrwx 0/0           34887 2003-02-21 16:25 flite.i386-aros/doc/flite.texi
-rwxrwxrwx 0/0             227 2002-12-30 04:47 flite.i386-aros/doc/intro.txt
-rwxrwxrwx 0/0             691 2003-02-23 03:32 flite.i386-aros/doc/stuff.ed
-rwxrwxrwx 0/0             583 2011-12-02 03:32 flite.i386-aros/flite.i386-aros.readme
-rwxrwxrwx 0/0           11346 2003-02-17 06:43 flite.i386-aros/README
drwxrwxrwx 0/0               0 2011-12-02 03:23 flite.i386-aros/sdk/
drwxrwxrwx 0/0               0 2011-12-02 03:23 flite.i386-aros/sdk/include/
-rwxrwxrwx 0/0            4254 2001-12-05 07:15 flite.i386-aros/sdk/include/cst_alloc.h
-rwxrwxrwx 0/0            3139 2001-12-05 07:15 flite.i386-aros/sdk/include/cst_args.h
-rwxrwxrwx 0/0            4665 2002-11-10 07:40 flite.i386-aros/sdk/include/cst_audio.h
-rwxrwxrwx 0/0            3853 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_cart.h
-rwxrwxrwx 0/0            4544 2002-07-07 12:51 flite.i386-aros/sdk/include/cst_clunits.h
-rwxrwxrwx 0/0            3695 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_diphone.h
-rwxrwxrwx 0/0            3672 2001-12-21 16:25 flite.i386-aros/sdk/include/cst_endian.h
-rwxrwxrwx 0/0            3487 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_error.h
-rwxrwxrwx 0/0            4723 2001-12-13 05:35 flite.i386-aros/sdk/include/cst_features.h
-rwxrwxrwx 0/0            4532 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_file.h
-rwxrwxrwx 0/0            3156 2001-12-05 07:15 flite.i386-aros/sdk/include/cst_hrg.h
-rwxrwxrwx 0/0            6484 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_item.h
-rwxrwxrwx 0/0            4024 2002-08-11 15:45 flite.i386-aros/sdk/include/cst_lexicon.h
-rwxrwxrwx 0/0            3820 2001-12-05 07:15 flite.i386-aros/sdk/include/cst_lts.h
-rwxrwxrwx 0/0            3330 2002-08-10 16:43 flite.i386-aros/sdk/include/cst_lts_rewrites.h
-rwxrwxrwx 0/0            3964 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_phoneset.h
-rwxrwxrwx 0/0            7668 2001-12-05 07:15 flite.i386-aros/sdk/include/cst_regex.h
-rwxrwxrwx 0/0            3781 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_relation.h
-rwxrwxrwx 0/0            3227 2001-12-05 07:15 flite.i386-aros/sdk/include/cst_sigpr.h
-rwxrwxrwx 0/0            3204 2001-12-05 07:15 flite.i386-aros/sdk/include/cst_socket.h
-rwxrwxrwx 0/0            3371 2001-11-25 04:36 flite.i386-aros/sdk/include/cst_ss.h
-rwxrwxrwx 0/0            3715 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_string.h
-rwxrwxrwx 0/0            5876 2011-12-02 03:14 flite.i386-aros/sdk/include/cst_sts.h
-rwxrwxrwx 0/0            4545 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_synth.h
-rwxrwxrwx 0/0            4262 2001-12-20 16:04 flite.i386-aros/sdk/include/cst_tokenstream.h
-rwxrwxrwx 0/0            3734 2001-12-21 16:25 flite.i386-aros/sdk/include/cst_track.h
-rwxrwxrwx 0/0            3693 2001-12-05 07:15 flite.i386-aros/sdk/include/cst_units.h
-rwxrwxrwx 0/0            4048 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_utterance.h
-rwxrwxrwx 0/0            3894 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_utt_utils.h
-rwxrwxrwx 0/0            5955 2001-12-28 08:23 flite.i386-aros/sdk/include/cst_val.h
-rwxrwxrwx 0/0           16584 2003-02-16 13:44 flite.i386-aros/sdk/include/cst_val_const.h
-rwxrwxrwx 0/0            7854 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_val_defs.h
-rwxrwxrwx 0/0            4934 2001-12-05 07:15 flite.i386-aros/sdk/include/cst_viterbi.h
-rwxrwxrwx 0/0            3612 2001-12-05 07:16 flite.i386-aros/sdk/include/cst_voice.h
-rwxrwxrwx 0/0            6855 2002-12-29 09:15 flite.i386-aros/sdk/include/cst_wave.h
-rwxrwxrwx 0/0            4228 2002-12-30 05:09 flite.i386-aros/sdk/include/flite.h
-rwxrwxrwx 0/0             232 2011-12-02 02:59 flite.i386-aros/sdk/include/flite_version.h
drwxrwxrwx 0/0               0 2011-12-02 03:24 flite.i386-aros/sdk/lib/
-rwxrwxrwx 0/0          561668 2011-12-02 03:14 flite.i386-aros/sdk/lib/libflite.a
-rwxrwxrwx 0/0         2167456 2011-12-02 03:14 flite.i386-aros/sdk/lib/libflite_cmulex.a
-rwxrwxrwx 0/0         7243408 2011-12-02 03:14 flite.i386-aros/sdk/lib/libflite_cmu_time_awb.a
-rwxrwxrwx 0/0         6217896 2011-12-02 03:14 flite.i386-aros/sdk/lib/libflite_cmu_us_kal.a
-rwxrwxrwx 0/0         7973262 2011-12-02 03:15 flite.i386-aros/sdk/lib/libflite_cmu_us_kal16.a
-rwxrwxrwx 0/0          246938 2011-12-02 03:14 flite.i386-aros/sdk/lib/libflite_usenglish.a